<template>
    <div>
         <!-- 面包屑导航区域 -->
<el-breadcrumb separator-class="el-icon-arrow-right">
  <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
  <el-breadcrumb-item>商品管理</el-breadcrumb-item>
  <el-breadcrumb-item>参数列表</el-breadcrumb-item>
</el-breadcrumb>

<!-- 卡片视图区域 -->
<el-card>
    <!-- 警告区域 -->
<el-alert
    show-icon
    title="注意：只允许第三级分类设置相关参数！"
    type="warning"
    :closable="false">
  </el-alert>

  <!-- 选择商品分类区域 -->
  <el-row class="cat_opt">
      <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
  <el-cascader
  expand-trigger="hover"
    v-model="selectedCateKeys"
    :options="catelist"
    :props="cateProps"
    @change="handleChange"></el-cascader>
      </el-col>
  </el-row>

  <!-- tab 页签区域 -->
   <el-tabs v-model="activeName" @tab-click="handleTabClick">
       <!-- 添加动态参数的面板 -->
   <el-tab-pane label="动态参数" name="many">
       <!-- 添加参数的按钮 -->
       <el-button type="primary" size="mini"
       :disabled='isBtnDisabled'
       @click="addDialogVisible = true">添加参数</el-button>
       <!-- 动态参数表格 -->
       <el-table :data="manyTableData" border stripe>
           <!-- 展开行 -->
           <el-table-column type="expand">
               <template slot-scope="scope">
                 <!-- 循环渲染Tag标签 -->
                   <el-tag v-for="(item, i) in scope.row.attr_vals"
                   :key="i" closable
                   @close="handleClose(i,scope.row)">
                        {{item}}
                   </el-tag>
                   <!-- 输入文本框 -->
                   <el-input
             class="input-new-tag"
            v-if="scope.row.inputVisible"
            v-model="scope.row.inputValue"
             ref="saveTagInput"
            size="small"
             @keyup.enter.native="handleInputConfirm(scope.row)"
            @blur="handleInputConfirm(scope.row)">
            </el-input>
            <!-- 添加按钮 -->
            <el-button v-else class="button-new-tag"
             size="small" @click="showInput(scope.row)">+ New Tag</el-button>
               </template>
           </el-table-column>
           <!-- 索引列 -->
           <el-table-column label="#" type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作" >
                <template slot-scope="scope">
                    <el-button size="mini" type="primary" icon="el-icon-edit"
                    @click="showEditDialog(scope.row.attr_id)">修改</el-button>
                    <el-button size="mini" type="primary" icon="el-icon-delete"
                    @click="removeParams(scope.row.attr_id)">删除</el-button>
                </template>
            </el-table-column>
       </el-table>
   </el-tab-pane>
   <!-- 添加静态属性的面板 -->
    <el-tab-pane label="静态属性" name="only">
        <!-- 添加属性的按钮 -->
        <el-button type="primary" size="mini"
        :disabled='isBtnDisabled'
         @click="addDialogVisible = true">添加属性</el-button>
         <!-- 静态属性表格 -->
       <el-table :data="onlyTableData" border stripe>
           <!-- 展开行 -->
          <el-table-column type="expand">
               <template slot-scope="scope">
                 <!-- 循环渲染Tag标签 -->
                   <el-tag v-for="(item, i) in scope.row.attr_vals"
                   :key="i" closable
                   @close="handleClose(i,scope.row)">
                        {{item}}
                   </el-tag>
                   <!-- 输入文本框 -->
                   <el-input
             class="input-new-tag"
            v-if="scope.row.inputVisible"
            v-model="scope.row.inputValue"
             ref="saveTagInput"
            size="small"
             @keyup.enter.native="handleInputConfirm(scope.row)"
            @blur="handleInputConfirm(scope.row)">
            </el-input>
            <!-- 添加按钮 -->
            <el-button v-else class="button-new-tag"
             size="small" @click="showInput(scope.row)">+ New Tag</el-button>
               </template>
           </el-table-column>
           <!-- 索引列 -->
           <el-table-column label="#" type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作" >
                <template slot-scope="scope">
                    <el-button size="mini" type="primary" icon="el-icon-edit"
                    @click="showEditDialog(scope.row.attr_id)">修改</el-button>
                    <el-button size="mini" type="primary" icon="el-icon-delete"
                    @click="removeParams(scope.row.attr_id)">删除</el-button>
                </template>
            </el-table-column>
       </el-table>
    </el-tab-pane>
    </el-tabs>
</el-card>

<!-- 添加参数的对话框 -->
<el-dialog
  :title="'添加'+titleText"
  :visible.sync="addDialogVisible"
  width="50%"
  @close="addDialogClosed">
  <!-- 添加参数的对话框 -->
  <el-form :model="addFrom" :rules="addFromRules" ref="addFormRef" label-width="100px">
  <el-form-item :label="titleText" prop="attr_name">
    <el-input v-model="addFrom.attr_name"></el-input>
  </el-form-item>
  </el-form>
  <span slot="footer" class="dialog-footer">
    <el-button @click="addDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
</el-dialog>

    <!-- 修改参数的对话框 -->
    <el-dialog
  :title="'修改'+titleText"
  :visible.sync="editDialogVisible"
  width="50%"
  @close="editDialogClosed">
  <!-- 添加参数的对话框 -->
  <el-form :model="editFrom" :rules="editFromRules" ref="editFormRef" label-width="100px">
  <el-form-item :label="titleText" prop="attr_name">
    <el-input v-model="editFrom.attr_name"></el-input>
  </el-form-item>
  </el-form>
  <span slot="footer" class="dialog-footer">
    <el-button @click="editDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editParams">确 定</el-button>
  </span>
</el-dialog>
    </div>
</template>

<script>
export default {
  data() {
    return {
      //  商品分类列表
      catelist: [],
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 级联选择框双向绑定到的数组
      selectedCateKeys: [],
      // 被激活的页签的名称
      activeName: 'many',
      // 动态参数的数据
      manyTableData: [],
      // 静态属性的数据
      onlyTableData: [],
      //   控制添加对话框的显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addFrom: {
        attr_name: ''
      },
      //    添加参数的表单数据对象
      addFromRules: {
        attr_name: [
          {
            required: true,
            message: '请输入参数名称',
            trigger: 'blur'
          }
        ]
      },
      // 控制修改对话框的显示与隐藏
      editDialogVisible: false,
      //   修改的表单数据对象
      editFrom: {},
      //    修改表单的验证规则对象
      editFromRules: {
        attr_name: [
          {
            required: true,
            message: '请输入参数名称',
            trigger: 'blur'
          }
        ]
      },
      // 控制按钮与文本框的切换显示
      inputVisible: false,
      // 文本框中输入的内容
      inputValue: ''
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    // 获取所有的商品分类列表
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败！')
      }

      this.catelist = res.data

    //   console.log(this.catelist)
    },
    // 级联选择框选中项变化，会触发这个函数
    handleChange() {
      this.getParamsData()
    },
    //  tab 页签点击事件的处理函数
    handleTabClick() {
      this.getParamsData()
    },
    // 获取参数的列表数据
    async getParamsData() {
      // 证名选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }

      // 证名选中的事三级分类
      console.log(this.selectedCateKeys)
      // 根据所选分类的Id，和当前所处的面板，获取对应的参数
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`,
        {
          params: { sel: this.activeName }
        })

      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败！')
      }

      console.log(res.data)
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals
          ? item.attr_vals.split(' ') : []
          // 控制文本框的显示与隐藏
        item.inputVisible = false
        // 文本框中输入的值
        item.inputValue = ''
      })

      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    //  监听添加对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    //  点击按钮，添加参数
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addFrom.attr_name,
          attr_sel: this.activeName
        })

        if (res.meta.status !== 201) {
          return this.$message.error('添加参数失败！')
        }

        this.$message.success('添加参数成功！')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    // 点击按钮，展示修改的对话框
    async showEditDialog(attrid) {
      // 查询当前参数的信息
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attrid}`, {
        params: { attr_sel: this.activeName }
      })

      if (res.meta.status !== 200) {
        return this.$message.error('获取参数信息失败！')
      }

      this.editFrom = res.data
      this.editDialogVisible = true
    },
    //  重置修改的表单
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
    },
    // 点击按钮,修改参数信息
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editFrom.attr_id}`,
          {
            attr_name: this.editFrom.attr_name,
            attr_sel: this.activeName
          })
        if (res.meta.status !== 200) {
          return this.$message.error('修改参数失败！')
        }

        this.$message.success('修改参数成功！')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    async removeParams(attrid) {
      const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)

      // 用户取消删除的操作
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除！')
      }

      // 删除的业务逻辑
      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attrid}`)

      if (res.meta.status !== 200) {
        return this.$message.error('删除参数失败！')
      }

      this.$message.success('删除参数成功！')
      this.getParamsData()
    },
    // 文本框失去焦点，或摁下 Enter 都会触发
    async handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      // 如果没有return，则证明输入的内容，需要做后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      // 发起请求
      this.saveAttrVals(row)
    },
    // 点击按钮，展示文本输入框
    showInput(row) {
      row.inputVisible = true
      // 让文本框自动获得焦点
      // $nextTick 方法的作用，就是当页面上元素
      // 被重新渲染之后，才会指定回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 删除对应的参数可选项
    handleClose(i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    },
    // 将对 attr_vals 的操作，保存到数据库
    async saveAttrVals(row) {
      // 需要发起请求，保存这此操作
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      })

      if (res.meta.status !== 200) {
        return this.$message.error('修改参数项失败！')
      }

      this.$message.success('修改参数项成功！')
    }
  },
  computed: {
    // 如果按钮需要被警用，则返回true，否则返回false
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    //  当前选中的三级分类的Id
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    //  动态计算标题的文本
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  }
}
</script>

<style lang="less" scoped>
 .cat_opt{
     margin: 15px 0;
 }

 .el-tag{
     margin: 10px;
 }

 .input-new-tag{
   width: 120px;
 }
</style>
